ML19210A626
| ML19210A626 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/17/1977 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Herbein J METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7910300660 | |
| Download: ML19210A626 (3) | |
Text
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^DISTRTPl! TION:
6 et Fi D Novenber 17, 1977 NRC POR RWoodruff,I&E L PDR PKellog,ISE ORB #4 Rdg Reg. I VStello ABDavis,1&E DockSt No.: 50-289 KRGoller Peg. I TJCarter RReid GZwetzig RIngram l'atropolitan Edison Cocipany Attorney, OELD ATTH: Mr. J. G. Herbein OI&E (3)
Vice President DEisenhut P. O. Box E42 TBAbernathy i
Reading, Pennsylvania 19603 JRBuchanan ACRS (16)
Gentlemen:
Gray File By letter dated September 8,1977, you comitted to performing psriodic vibration testing and ultrasonic inspection of the shafts uf the decay heat pumps at Three Mile Island Nuclear Station Unit No.1 (THI-1).
This comitment was made at the request of the staff in order to provide assurance of continued shaft integrity pending our review of metallurgical and systems data relating to the cause of the failure of a similar shaft at Crystal River Unit No. 3.
The comitment also constituted an acceptab7e alternative to prompt disassembly and inspection of the THI-1 shafts us.iag direct visual techniques.
By letter dated November 10, 1977, you stated that you did not intend to perform further shaft testing which would require uncoupling of the shaft.
Per telecon between Mr. G. B. Zwetzig of the NRC and Mr. Ron Stevens of your staff, it was determined thet your statement meant that Het Ed intended to discontinue'the ultrasonic inspection corimitted to in their letter of September 8, 1977.
This is to advise you that we have not concluded our review of this issue and therefore have no basis for concluding that termination of periodic ultrasonic inspection of these shafts is acceptable. Moreover, neither in your letter of Novec6er 10.1977, nor in other correspondence do you provide en acceptable basis for teminating such ultrasonic inspection.
8ccordingly, we do not concur with termination of the periodic ultrasonic examination of the decay heat pump shafts at this time. ~ In this regard, however, we are currently considering your request to chanse the frequency for ultrasonic inspection of the decay heat pump shafts freci a monthly basis to a quarterly basis. Our determination in C.L regard, if found acceptable, will be the subject of separate correspondence.
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Metropolitan Edison Cocpany Therefore, until such time that we conclude that an acceptable basis has been established for terminating the subject vibration measurerents and ultrasonic inspections we will expect you to continue to honor your cocritment to perfom these tests as stated in your letter of September 8,1977. Please advise us within 10 days of receipt of this letter if you still intend to unilaterally terminate these tests.
Sincerely,
-?!?r Robert W. Reid, Chief Operating Reactors Branch f4 Division of Operating Reactors cc: See next page 1492 225 l
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NEC FORM 313 (p.76) NRCM 0240 W a s..oys,,,sunw emuruee orricas este.ee a
i Metropolitan Edison Company cc:
G. F. Trowbridge, Esquire Shaw, Pittman, Potts & Trowbridge 1800 M Street, N. W.
Washington, D. C.
20036 a
GPU Service Corporation Richard W. Heward, Project Manager Mr. T. Gary Broughton, Safety and
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Licensing fianager 260 Cherry Hill Road Parsippany, New Jersey 07054 Pennsylvania Electric Company Mr. R. W. Conrad Vice President, Generation 1001 Broad Street
'Joh6stown,'Penns/ vania 15907 1
Miss Mary V. Southard, Chairman Citizens for a Safe Environment P. O. Box 405 Harrisburg, Pennsylvania 17108 Government Publications Section State Library of Pennsylvania Box 1601 (Education Building)
Harrisburg, Pennsylvania 17126 AM
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f 1492 226